Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Toyota 4x4 > General Tech Forum

Thread Tools
Old 01-15-2018, 04:45 PM
Uncle Ben's Avatar
Uncle Ben Uncle Ben is offline
Rising Sun Member
Join Date: Aug 2005
Location: Northside
Posts: 14,020
Send a message via AIM to Uncle Ben

I would gusset the gap then have it ceramic coated.
TLCA #3007

I'm the God-fearing, gun-toting, American flag-waving, conservative you were warned about!
Originally Posted by Jacket View Post
Welcome. Lots of "northsiders" here in the club. We're known to have some of the strongest, coolest and most awesome club members.
Originally Posted by Red_Chili View Post
Cruisers are superior
Reply With Quote
Old 01-15-2018, 05:23 PM
60wag's Avatar
60wag 60wag is offline
Rising Sun Member
Join Date: Aug 2005
Posts: 2,024

I expect the cracking of the manifold is due to thermal stress rather than corrosion. The ceramic coatings do the best job of keep the heat in the exhaust gas rather than letting it move into the manifold. That should reduce the stress.

This is a 2 stroke engine right? Generally the 2 stroke exhaust is significantly cooler than 4 stroke. The manifold shouldn't be getting that hot - unless its running really lean. Is there any sticky goo in the rest of the exhaust pipe?
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln
Reply With Quote
Old 01-18-2018, 09:53 AM
nakman's Avatar
nakman nakman is offline
Rising Sun Member
Join Date: Aug 2005
Location: north side
Posts: 11,294

No idea on sticky goo. So I cleaned up the pipe and hit it with bbq paint, dropping it off tonight. This is a 15yo snowmobile if the first Y pipe lasted 10 I bet this one goes another 10 easy, heck feels like this winter is almost over already.
82 fj40, 06 gx470

05 525EXC, 06 TW200, 89 TW200, 09 TTR125, 07 TTR90


Reply With Quote
Old 01-18-2018, 10:48 PM
OilHammer's Avatar
OilHammer OilHammer is online now
Rising Sun Member
Join Date: Apr 2009
Location: Denver
Posts: 1,501

I didn't catch it the first time I read it, but you did say "crack". That tells me paint wasn't the reason for common failures, it's expansion. So, others comments about a gusset and a ceramic coat make sense to me. Still, I probably wouldn't do that THIS season but would wait till summer given what you said. If you want a professional opinion ( worth far more than mine) I have a crew of seasoned professional welders on site in boulder for the next 3-4 months. These guys weld exotic pipes for a living, so we could ask them for $.02.
1978 13BT-40, 70 series mechanicals
1966 FJ45 lwb stock
2003 100 OME lift
1974V8J40, 1992FJ80, 1985FJ60, 1971FJ55, 1978FJ40, 1974FJ40, 1997 LX450 all long gone.
Reply With Quote
Old 01-19-2018, 09:57 AM
rover67's Avatar
rover67 rover67 is offline
Rising Sun Member
Join Date: Nov 2007
Location: Boulder, Co
Posts: 6,809

Yeah that's what I was getting at. It's the expansion and contraction of the metal with the flanges clamped down hard that's probably causing it to crack. Making it stiffer with gussets and stuff can backfire and that's why I was mentioning stuff I've done in the past just moving the crack somewhere else. The mention of a slip plate seems interesting.

That or you could build a new one with one half slipping into the other with a sleeved joint or something? that might not be too hard.

also, think 2uzfe log style manifold cracking. going to headers helps maybe because there is more flex int eh assembly with longer pipes. in this scenario you can't extend the y pipe halves because it'd mess with tuning.
Marco Capote
85 FJ60
82 FJ40
Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 11:37 PM.

Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.